Use unicode-range to prevent unnecessary @font-face donwnloads

Source/core/css/CSSFontFace.h

 /*
  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 19 matching lines @@
 #include "core/css/CSSFontFaceSource.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class CSSSegmentedFontFace;
 class FontDescription;
+class FontResource;
 class SimpleFontData;
 
 class CSSFontFace : public RefCounted<CSSFontFace> {
 public:
     static PassRefPtr<CSSFontFace> create(PassRefPtr<CSSFontFaceRule> rule, bool isLocalFallback = false) { return adoptRef(new CSSFontFace(rule, isLocalFallback)); }
 
     struct UnicodeRange;
 
     void addRange(UChar32 from, UChar32 to) { m_ranges.append(UnicodeRange(from, to)); }
     const Vector<UnicodeRange>& ranges() const { return m_ranges; }
 
     void setSegmentedFontFace(CSSSegmentedFontFace*);
     void clearSegmentedFontFace() { m_segmentedFontFace = 0; }
 
     bool isLoaded() const;
     bool isValid() const;
 
     void addSource(PassOwnPtr<CSSFontFaceSource>);
 
+    void beginLoadingFontSoon(FontResource*);
     void fontLoaded(CSSFontFaceSource*);
 
     PassRefPtr<SimpleFontData> getFontData(const FontDescription&, bool syntheticBold, bool syntheticItalic);
 
     struct UnicodeRange {
         UnicodeRange(UChar32 from, UChar32 to)
             : m_from(from)
             , m_to(to)
         {
         }
@@ skipping 29 matching lines @@
     CSSSegmentedFontFace* m_segmentedFontFace;
     Vector<OwnPtr<CSSFontFaceSource> > m_sources;
     CSSFontFaceSource* m_activeSource;
     LoadState m_loadState;
     RefPtr<CSSFontFaceRule> m_rule;
 };
 
 }
 
 #endif